CN1036185C - Anti-counterfeiting printing machine - Google Patents

Abstract

A machine for security printing on security papers, in particular banknotes, comprises a feeding device (1), in particular in the form of individual sheets, a device for feeding the papers, and a device (19) for applying optically variable images carried by at least one strip which is in contact with the papers so as to print them at determined positions on the papers corresponding to the printed marks on the security papers. The device (19) for applying the image comprises at least one inking cylinder (11) cooperating with an impression cylinder (20) between which the paper is moved. The strip is mounted between two rollers fixed to an inking cylinder (11) and is advanced perpendicularly to the path of the sheet along a generatrix of said inking cylinder, under the action of an intermittent drive of a servomotor at each inking station.

Description

 

The invention relates to a machine for anti-counterfeiting printing on security paper, especially banknotes, which comprises a paper feeding device, especially a device for feeding paper in sheet form, a paper conveying device and a belt carried by at least one strip. Device for imprinting optically variable images, the strip being in contact with the paper, thereby imprinting the images on the paper at defined positions corresponding to the printed indicia on the security.

It is well known that as an anti-counterfeiting area, the optical variable image is combined in the form of a film on bank cards and securities paper, especially on banknotes, in order to prevent these cards, securities, and banknotes from being counterfeited, especially by using duplicators for copying and counterfeiting , the quality of its reproduction is improving day by day. These darkened images, including holographic or cinematic images, have the property of changing appearance with viewing angle. The image can be hot stamped, for example on a credit card, or cold stamped, especially on banknotes.

A device of this type mentioned above is known from patent publication EP-A 0,441,596, which describes in particular a method and a device for cold printing such an image on banknotes. According to this device, after completing the partial printing of the viscous ink on the paper at the determined position corresponding to the printing mark on the banknote, and after drying in front of the ultraviolet drying device, the paper in the form of a single sheet is conveyed into an application light. Apparatus for changing an image, the image being carried by a strip provided for each printed column on a release reel mounted in a first cassette and a reel mounted in a second cassette Take the unroll between the rounds. In addition to rollers, guides and tension rollers, the run between the two wheels consists of a drum whose outer circumference is provided with grooves provided with bridges through which the strip passes. The paper to be processed advances between said cylinders and an impression cylinder, and the image is transferred each time it passes over the impression cylinder. The whole system is arranged such that the path of the web is in the same direction as the path of the paper, but it has a variable speed drive. Assembly and precise control of such variable speed drives are complex and prone to failure.

Another device is also known from patent publication WO90/14953, which transfers the film from the web to the web by passing the web between the web and a heated stencil mounted on a rotary drum superior. This cylinder with a heated plate or several heated plates is driven synchronously with the web, the strip and the film to be conveyed move in a direction substantially perpendicular to the direction of movement of the web, the strip The tape advances between a discharge cassette and a take-up cassette, which are secured transversely on each side of the rotary drum. In this arrangement, the web must be pressed tightly against a substantial portion of the cylinder periphery in order to allow sufficient heating time and for the film to bond to the web. This pressure is produced by at least two pressure belts which press the web against the cylinder half-periphery and drive the cylinder in rotation synchronously. A disadvantage of this known device is that it is necessary to have a heating device for the stencil and the special pressure belt in the rotary drum.

The object of the present invention is to provide a machine which simplifies the system of imprinting the image, the travel of the web and the exchange of the web, and has a simple structure which ensures correct registration at the same time.

The technical scheme of the present invention is: provide a kind of machine that is used for carrying out anti-counterfeiting printing on security paper, especially banknote, comprise a paper feeding device, especially the device that feeds paper in sheet form, a device for conveying paper and a Apparatus for applying optically variable images carried by at least one strip which is in contact with paper so as to imprint these images on the paper at defined positions corresponding to printed marks on security paper, characterized by In that, the said application device comprises at least one ink application cylinder matched with the impression cylinder, and the paper moves in between the two impression cylinders, wherein the strip is mounted on the two ink application cylinders fixed on the ink application cylinder. Between the rollers, and the strip with the servo motor is intermittently driven by each inking station, and is conveyed forward along the generatrix of the inking cylinder and perpendicular to the paper path, and the printed image The upstream end of the device is provided with a device for imprinting the adhesive stamp on the paper where the image is intended to be embossed.

The advantage of the present invention over prior devices is that once the image has been printed on the paper, the inking cylinder continues to rotate while the strip, whose path is perpendicular to the paper path, is released from the impression cylinder so that it can be advanced and Place in the desired position for the next step of printing. Thus, one revolution of the inking cylinder can be used to adjust the new position of the strip, which is easily sufficient to ensure full register. Furthermore, since the system for transporting the image-laden web is built into the inking cylinder, it is possible to have a compact overall configuration.

According to a preferred embodiment of the present invention, the tape is mounted in a single cassette containing two reels in order to print all the images simultaneously on the paper in one printing process.

The inking cylinder preferably comprises a plurality of adjacent sectors each provided with a tape cassette, the sectors enabling a plurality of lines of images to be applied as the inking cylinder operates. In the preferred case of using a sheet form, it is possible to print multiple rows and columns of images on the same sheet with each revolution of the inking cylinder.

With reference to the accompanying drawings, the invention is described by way of a non-limiting example of the processing of paper in sheet-fed form. in:

Fig. 1 shows a general view of the first embodiment of the anti-counterfeiting printing machine of the present invention.

Figure 2 shows an end view of the inker roller.

FIG. 3 is a side view of FIG. 2 .

Figure 4 is an enlarged view of the inking sector portion of the inking cylinder.

Fig. 5 shows a general view of the second embodiment of the anti-counterfeiting printing machine of the present invention.

FIG. 6 is a view of the ink applicator of the printing press of FIG. 5 .

Fig. 7 shows a general view of the third embodiment of the anti-counterfeiting printing machine of the present invention.

Referring to Figure 1, a security printing machine comprises a device 1 for feeding a single sheet of security paper, especially banknotes, which device includes a paper feeder. These papers that have been or have not been partially printed are conveyed one by one to the device 3 for applying liquid adhesive through the paper feeder and the paper feeder 2, so that the paper is printed on the banknotes for each printing mark or A bonding mark is printed on at least one definite position where the printing marks are reserved. The printed marks on each paper are arranged in N columns and X rows. The so-called "column" refers to the arrangement of a series of printed marks along the direction of paper conveyance, and the so-called "row" refers to the arrangement of a series of printed marks along the direction of paper conveyance. Arranged vertically. According to the above example, N is equal to 4 and X is equal to 10. The device 3 is therefore designed as an inking device, a roller 5 half submerged in an ink fountain 4, which applies said liquid adhesive to a roller 6 with a stencil, which selectively The adhesive print is transferred to defined positions on the sheet, which passes between the stenciled roller 6 and an impression cylinder.

In the embodiment shown, this device 3 also includes a device for applying a second security means, in particular a relief printing device 8 capable of printing a security image in the original manner. The means 3 , 4 , 5 for applying the adhesive can also be of another form, for example similar to relief printing means such as means 8 .

The paper is then picked up by a transport system 9 which passes the paper in front of an ultraviolet lamp 10 which acts as a catalyst for the adhesive imprint and thereby activates the adhesive. In order to prevent the binder from polymerizing, the time for the paper to pass through the lamps 10 and print the image must be controlled within 3-10 seconds.

Next, the sheet is conveyed into a device 19 for printing an optically variable image 12 in the form of a film, which image has the appearance of, for example, a speckle and is carried by a strip 13.

In the example shown in FIG. 1, the device 19 comprises two inking cylinders 11 and 11' mounted in series, each cooperating with an impression cylinder 20, 20' and a transfer cylinder 21, respectively.

The paper to be printed is in contact with the inking cylinder only along a contact line, and its width corresponds to the width of a row of images to be transferred. The guidance of the paper is guaranteed by the impression cylinder 20, and the paper is guided around the impression cylinder. part of the periphery. The impression cylinder presses the paper against the image-bearing strip 13 mounted on the periphery of the cylinder 20 so that these images are transferred.

Referring now to Figures 2 through 4, the apparatus for printing image 12 will be described in more detail. The inking cylinder 11 is designed to simultaneously apply a sequence of X images 12, for example 4 images, to the adhesive print on the paper, that is to say all printed marks belong to the same line printing sequence. Such images 12 are therefore arranged on strips 13 at a suitably defined distance from each other so that the images are applied to the paper in the desired registration. The bonding between the image and the strip can be done by means of wax, for example. The strip 13 itself is mounted in a rigid tape cassette 14 containing two reels 15, 15' between which the two strips are released, the transmission of the strip 13 being ensured by a servo motor 16 which also contributes to Align image 12. The release direction of the strip 13 located between the two reels of the adhesive tape cassette 14 can be parallel to the axis of the above-mentioned cylinder 11 . This transport direction is therefore perpendicular to the direction of motion of the sheet passing between the inking cylinder 11 and the impression cylinder 20 .

In order to better adjust the support and tension of the strap, a second servo motor 16' can also be provided for driving other reels. The power lines of the servo motor or multiple servo motors pass through the drum 11 or the interior of the hollow shaft 11a of the multiple drums 11, as shown by the dotted line in FIG. 3 .

The effective length of the tape cassette, which corresponds to the length of the inking cylinder 11, itself corresponds to the width of the paper to be printed, ie to the dimension of the paper taken perpendicular to the direction of paper movement.

In order to print the image 12 on all the prints of the same column on a piece of paper (taking ten as an example), the adhesive tape cassette 14 is installed in groups of five on the fan-shaped area on each cylinder 11 and 11 ' In this way, the first cylinder 11 prints the images of odd-numbered rows and columns on the paper, and the second cylinder 11' prints the images of even-numbered rows and columns on the paper. This is done in order to avoid too dense fan-shaped areas.

Under the situation that the summation of the number of tape boxes of the first cylinder and the number of tape boxes of the second cylinder is equal to the number of X rows and columns of each printing paper, the tape boxes can be randomly distributed between 11 and 11 ' between the two cylinders.

In the example shown in Fig. 2, each inking cylinder 11 and 11' comprises two sets of adhesive tape cassettes 14 distributed in two diametrically opposed flat areas in groups of five, each of the cylinders 11 and 11' All images can be printed on two continuous sheets in one turn. The adhesive tape cassette 14 is mounted on the cylinder 11 ( FIG. 3 ) so that the free part located between the two rollers 15 , 15 ′ applies ink along a generatrix of the inking cylinder 11 . Furthermore, facing said busbars, the cassette 14 is also provided with a liner 18 over which the strips run. The strip 13 is unwound from a reel 15 and guided by a tension roller 23 . These pads 18 can be adjusted axially and also radially with the separation distance between two successive images, that is to say with the number of printed marks per column placed on the sheet. These pads thus enable the positioning of the image on the one hand and, on the other hand, provide sufficient pressure on the image 12 on the paper when the image is printed. It can also be seen from FIG. 4 that the tensioning roller 17 tensions the strip 13 between two pads 18 .

The length of the strip between the two cylinders 15, 15' varies with the size of the printed image 12, the number of pads 18 per strip and the distance between two pads 18.

Tape cassettes are prepared in advance according to the nature of the paper to be printed. For example, in the example shown above, if the paper to be printed contained ten rows and four columns of printing on the banknote, the cassette would be designed to print four images simultaneously on the same row and column as the paper moved forward.

The inking cylinders rotate continuously with the printing press, and the relative speeds of the inking cylinders are such that the second inking cylinder 11' prints the images of the intermediate lines and the first inking cylinder 11 prints the images 12 on the On the imprint of two lines on the paper. The pressure between the two inking cylinders 11, 11' and the two impression cylinders 20, 20' is relatively low, such as about 300g/cm ² , and the image 12 on the strip 13 is not bonded by the wax itself. very high.

As mentioned above, the feeding of the strips from the tape cassettes is effected by a servo motor 16, and the cassettes are attached to the center of the drum 11 and pass through the spindle. Servomotor 16 is run intermittently in order to feed the web between ink application strokes while all other parts of the printing press are running continuously. When the flat area of the inking cylinder 11 is in the inking position, i.e. opposite to the row and column of the bonded print on the paper, the strip carrying the image 12 is stationary and the servo motor 16 only maintains the alignment. Once a row of N images is printed on the paper, while the inking cylinder 11 continues to run, the servo motor is turned on to deliver a new length of strip 13 with a new pattern. During the complete revolution of the inking cylinder 11, a sufficient period of time is available to drive the servo motor to feed a new length of strip and to register the new image.

At the output of the image printing unit 19, the sheets are taken away by an output system 22 which transfers them to another printing process. Imprinting of the image on the optically variable film is preferably done before printing the paper into banknotes, so that the image itself at least partially receives an imprint that increases security.

Figures 5 and 6 show another embodiment of the printing machine showing a different arrangement of the components. Paper input from a paper feeding device 100 is picked up by an impression cylinder 107 on which an embossing roller 106 is used to make the paper receive adhesive marks from an ink fountain 104 at its predetermined position. The paper is then conveyed directly to a conveyor system 109 which moves the paper vertically in front of the UV lamp 110 and then conveys the paper to the printing unit 119 . Contrary to the previous example, this device 119 comprises a single impression cylinder 120 cooperating directly with the two application cylinders 111, 111'. The inking cylinders 111 , 111 ′ are each provided with ten tape cassettes 140 distributed in two sectors and act alternately on the paper passing between the two inking cylinders and the impression cylinder 120 .

Fig. 7 represents a third embodiment of this printing machine, and the difference between it and the whole set of devices of Fig. 1 is that the device for conveying paper is different, and it does not include conveying system 9, but comprises two conveying rollers, namely two are arranged in drying The transfer rollers 24 on both sides of the drum 25 are surrounded by ultraviolet lamps 10 around the periphery of the drying drum. Since the other components have the same reference numerals as those of the first embodiment and correspond thereto, no description will be given of the other components. The device 3 for applying the adhesive has been simplified in this case, since no letterpress printing device is included.

It is also conceivable to use a two-component adhesive, one component being applied by the inking device 3, as shown in FIG. The two components become active once pressed against each other, and like some two-part adhesives, it will save a station for passing under a UV lamp.

The invention is not limited to the described embodiments, and other variations are also conceivable without departing from the scope of the invention, in particular with regard to the device for conveying the paper, the inking device, the construction of the tape cassette and their installation in the inking cylinder . The positioning of the cassettes on the inking cylinder can also be different, in particular instead of mounting them in the sector, the cassettes can extend beyond the sector on one or both sides of the inking cylinder, and/or It extends diametrically, that is to say the tape cassette extends radially beyond the axis of the inking cylinder. The device described above is also applicable to web printing presses.

Claims (11)

1. one kind is used at loan, especially carry out the machine of anti-counterfeit printing on the bank note, comprise a paper feeding device, especially with the device of individual sheet form paper feeding, one transmits the device of paper and one is used for applying seal is become image (12) by the light of at least one band (13) carrying device (19), this band contacts with paper, thereby with these images be printed on the paper with loan on typographic(al) mark determine on the position accordingly, it is characterized in that, described deposited printing device (19) comprises that at least one matches with impression cylinder (20) executes inking roller tube (11), paper is shift-in between described two impression cylinders (20), wherein said band (13) just is installed on and is fixed on two rolling wheels (15 executing on the inking roller tube (11), 15 ') between, and wherein band is executed black station off and under the driving effect at servomotor in each, along the described bus of executing the inking roller tube, direction perpendicular to paper path forwards, and is provided with a device (3) in the upstream ends of the device (19) of picture printing and is used for the bonding marking added to be printed on predeterminedly on the paper will printing additional this visual position.

2. machine as claimed in claim 1, it is characterized in that, described band (13) is installed in the single adhesive tape box (14) that comprises two rollers, at least the major part of described adhesive tape box (14) is arranged at described inking roller tube (11) inside of executing, preferably be arranged in the fan section of executing the inking roller tube, the effective length of adhesive tape box is corresponding to the length of executing inking roller tube (11), and the length itself of executing the inking roller tube is corresponding to paper width to be printed, that is to say corresponding to by the size that obtains perpendicular to its travel direction.

3. machine as claimed in claim 2 is characterized in that, described adhesive tape box (14) is arranged at the inside, fan section of executing inking roller tube (11).

4. machine as claimed in claim 2 is characterized in that, the major part of described adhesive tape box (14) be arranged at the flat district that executes inking roller tube (11) inner and at least one side in side with and/or radially stretch out described executing outside the inking roller tube.

5. as the described machine of claim 2 to 4, it is characterized in that the described inking roller tube (11) of executing comprises many fan sections that are provided with the mutual vicinity of an adhesive tape box (14) separately.

6. machine as claimed in claim 5 is characterized in that, is using with situation individual sheet form, that be arranged in the paper that the typographic(al) mark on the security arranges by row, column on it, and the printing line number of the number in fan section and every paper is corresponding.

7. machine as claimed in claim 6, it is characterized in that, execute the continuous setting of inking roller tube (11,11 ') also alternately to working with a piece of paper for described two, adhesive tape box number that fan section number and each are executed the inking roller tube designs to such an extent that make the two number sum equal the printing line number of every paper.

8. machine as claimed in claim 6, it is characterized in that, described tape cassette is arranged in the radially relative fan section of executing inking roller tube 11 in couples and after one and half revolutions of executing the inking roller tube, alternately a series of images (12) is printed on one-tenth one print line on two continuous paper.

9. machine as claimed in claim 1 is characterized in that, can be provided with a drying device in device (3) back, particularly a UV curing device.

10. device as claimed in claim 1 is characterized in that, described binding agent is two component binding agents, and its a kind of composition applies seal by described deposited printing device (3), and second kind of composition is then on the background color of described image (12).

11., it is characterized in that the device (3) that described deposited seal is executed binding agent also comprises a printing unit as claim 1 or 10 described machines, particularly one can antiforge the letterpress parts 8 of image, these two parts have a shared impression cylinder (7).

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